Abstract
Abstract Problem-based learning (PBL) is one of the recommended teaching materials model in the 2013 curriculum. The purpose of this research was to develop learning materials of natural science of characters-based problems on light and optical concept in junior high School four east Praya. Research and development study refering to Dick & Carey model. Validaton by three experts (media, content, and language). The results of the first validation obtained an average of 3.6 and second validation obtained an average of 4.1, this indicates that learning materials are feasible and relevant to be used as learning resources for class VIII. The results of the reading level by Kincaid readability showed that out of 76 pages there were 40 pages of text that corresponded to the junior high school class VIII with a percentage of 52.6%, while the non-compliant text contained 36 pages with a percentage of 47%. The results of a limited trial showed that responses from students by 28% with categories quite interesting, 36% interesting, and 36% very interesting. In conclusion, learning materials of natural science of characters-based problems on light and optical concept was feasible to be applied in science learning processes.